<template>
	<view>
		<!-- <my-search :bcbgcolor="'pink'" :radius="15"></my-search> -->
		<my-search @click="gotoSearch"></my-search>
	    <view class="scroll-view-container">
	      <!-- 左侧的滚动视图区域 -->
	      <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
	        <block v-for="(item, i) in cateList" :key="i">
	          <view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
	        </block>
	      </scroll-view>
	      <!-- 右侧的滚动视图区域 -->
	      <scroll-view class="right-scroll-view" scroll-y :style="{height:wh+'px'}" :scroll-top="scrollTop">
	        <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
				<!-- 右侧二级 -->
	            <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
				<!-- 右侧三级 -->
			    <view class="cate-lv3-list">
			      <!-- 三级分类 Item 项 -->
			      <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
			        <!-- 图片 -->
			        <image :src="item3.cat_icon"></image>
			        <!-- 文本 -->
			        <text>{{item3.cat_name}}</text>
			      </view>
			    </view>	
	        </view>
	      </scroll-view>
	    </view>	
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins: [badgeMix],
		data() {
			return {
				 wh: 0,
				 cateList: [],         //一级分类列表
				 active:0,
				 cateLevel2: [],       // 二级分类列表
				 scrollTop: 0,
			}; 
		},
		onLoad() {
		      // 获取当前系统的信息[这个属性可以获得当前是什么品牌手机等等]
		      const sysInfo = uni.getSystemInfoSync()
		      // 为 wh 窗口可用高度动态赋值
		      this.wh = sysInfo.windowHeight-50
			  // 调用获取分类列表数据的方法
			  this.getCateList()
		},
		methods: {
		  async getCateList() {
		    // 发起请求
		    const { data: res } = await uni.$http.get('/api/public/v1/categories')
		    // 判断是否获取失败
		    if (res.meta.status !== 200) return uni.$showMsg()
		    // 转存数据
		    this.cateList = res.message
			this.cateLevel2 = res.message[0].children
		  },
		  //左侧一级栏被选高亮
		  activeChanged(i){
			  this.active = i
			  this.cateLevel2 = this.cateList[i].children
			  this.scrollTop = this.scrollTop === 0 ? 1 : 0
		  },
		  gotoGoodsList(item3) {
		    uni.navigateTo({
		      url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
		    })
		  },
		  gotoSearch() {
		       uni.navigateTo({
		         url: '/subpkg/search/search'
		       })
		  }
		}
	}
</script>

<style lang="scss" scoped>
.scroll-view-container {
  display: flex;

  .left-scroll-view {
    width: 120px;

    .left-scroll-view-item {
      line-height: 60px;
      background-color: #f7f7f7;
      text-align: center;
      font-size: 12px;

      // 激活项的样式
      &.active {
        background-color: #ffffff;
        position: relative;

        // 渲染激活项左侧的红色指示边线
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
  }
}
.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;

  .cate-lv3-item {
    width: 33.33%;
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;

    image {
      width: 60px;
      height: 60px;
    }

    text {
      font-size: 12px;
    }
  }
}
</style>
